Fix swapchain semaphore reuse validation warning

[sammifs]

Summary

Attempted fix for a repeating Vulkan validation warning caused by reusing the semaphore passed to vkQueuePresentKHR as a per-frame resource instead of a per-swapchain-image resource.

This change updates the present-ready semaphores to be allocated per swapchain image and indexed by the acquired image index, I really tried to follow and understand the guidance here:
https://docs.vulkan.org/guide/latest/swapchain_semaphore_reuse.html

I still can not claim any expertise in these concepts/structures, but by following the page above and the example fix commit they linked to I got the warning to disappear. Compiles and runs and I cant spot anything amiss.

Problem

Running the current main produces the following repeating validation warning (memory addresses/ image indices vary of course):

validation layer: vkQueueSubmit(): pSubmits[0].pSignalSemaphores[0] (VkSemaphore 0x1f000000001f) is being signaled by VkQueue 0x749abe0, but it may still be in use by VkSwapchainKHR 0x40000000004.
Most recently acquired image indices: [0], 1, 2.
(Brackets mark the last use of VkSemaphore 0x1f000000001f in a presentation operation.)
Swapchain image 0 was presented but was not re-acquired, so VkSemaphore 0x1f000000001f may still be in use and cannot be safely reused with image index 2.
Vulkan insight: See https://docs.vulkan.org/guide/latest/swapchain_semaphore_reuse.html for details on swapchain semaphore reuse. Examples of possible approaches:
   a) Use a separate semaphore per swapchain image. Index these semaphores using the index of the acquired image.
   b) Consider the VK_KHR_swapchain_maintenance1 extension. It allows using a VkFence with the presentation operation.
The Vulkan spec states: Each binary semaphore element of the pSignalSemaphores member of any element of pSubmits must be unsignaled when the semaphore signal operation it defines is executed on the device (https://docs.vulkan.org/spec/latest/chapters/cmdbuffers.html#VUID-vkQueueSubmit-pSignalSemaphores-00067)